Analysis and design of a high‐efficiency three‐coil WPT system with constant current output. Issue 10 (20th July 2020)

• Record Type: Journal Article
• Authors: Yang, Lin; Li, Xiaoming; Xu, Ziwei; Liu, Sheng; Dong, Zifan; Wu, Yuanbao
• Is Part Of: IET electric power applications. Volume 14:Issue 10(2020)
• Page Start: 1933
• Page End: 1943
• Publication Date: 2020-07-20
• Subjects: zero voltage switching -- inductive power transmission -- switching convertors -- coils; zero voltage switching operation -- efficiency analysis -- SS WPT system -- three‐coil system -- high‐efficiency three‐coil WPT system -- constant current output -- wireless power transfer system -- traditional plug‐in charging system -- two‐coil WPT system -- WPT systems -- CCO -- ZPA operation; Electric power -- Periodicals; Electric power systems -- Periodicals; 621.305
• DOI: 10.1049/iet-epa.2019.0967
• Languages: English
• ISSNs: 1751-8660

Abstract

Abstract : The wireless power transfer (WPT) system has been widely researched due to its inherent advantages compared with the traditional plug‐in charging system over security, flexibility, convenience and so on. Compared with the two‐coil WPT system, the three‐coil WPT system has been proven to have higher efficiency over a relatively long transmission distance. In many applications, WPT systems are required to have the load‐independent constant current output (CCO) characteristic and zero phase angle (ZPA) operation. This study proposes a three‐coil WPT system that can achieve the CCO and ZPA operation through flexible parameter design. First, the detailed mathematical deduction for the CCO and ZPA operation is given. Then, a comprehensive analysis of the three‐coil WPT system is conducted in term of parameter design, the sensitivity of the CCO to changes in compensation parameters, implementation of zero voltage switching operation and efficiency analysis. Furthermore, a detailed efficiency comparison with the SS WPT system is performed to reflect the high efficiency of the proposed three‐coil system, and the additional performance of the proposed three‐coil system is compared with previous related works to verify its advantages further. Finally, the correctness of the theoretical analysis is verified by simulation and experiment.